Datasheet

MAX132
±18-Bit ADC with Serial Interface
4 _______________________________________________________________________________________
__________________________________________Typical Operating Characteristics
-0.30
-0.25
-0.20
-0.15
-0.10
-0.05
0.05
0
ERROR vs. COMMON-MODE
INPUT VOLTAGE (V
IN
LO–AGND)
MAX132-01
COMMON-MODE VOLTAGE (V)

-3 -2 -1 0 1 2 3 4-4
ERROR (% OF FSR)
IN HI = IN LO
0
0 0.5 1.5
50Hz/60Hz READ-ZERO OFFSET
vs. VREF
1.5
3.5
MAX132-02
VREF (V)
READ-ZERO OFFSET (% OF FSR)
1.0 2.0
2.5
4.0
1.0
0.5
3.0
2.0
4.5
60Hz MODE
50Hz MODE
0
-40 -20 20
50Hz/60Hz READ-ZERO OFFSET
vs. TEMPERATURE
0.6
1.4
MAX132-03
TEMPERATURE (°C)
0 40 60 80 100
1.0
1.6
0.4
0.2
1.2
0.8
READ-ZERO OFFSET (% OF FSR)
60Hz MODE, VREF = 545mV
50Hz MODE, VREF = 655mV
-40
0 50 150
SUPPLY CURRENT
vs. CRYSTAL FREQUENCY
20
100
MAX132-04
CRYSTAL FREQUENCY (kHz)
SUPPLY CURRENT (µA)
100 200 250 300 350
60
120
0
-20
80
40
140
V-
V+
0.10
0.08
0.06
0.04
0.02
0
FULL-SCALE ROLLOVER ERROR
vs. VREF
MAX132-05
VREF (V)
0 0.5 1.0 1.5 2.52.0
ROLLOVER ERROR (% OF FSA)
0
5
10
15
20
NOISE vs. NUMBER
OF SAMPLES AVERAGED
MAX132-06
NUMBER OF SAMPLES AVERAGED
0102030 5040
NOISE (µV
RMS
)
______________________________________________________________Pin Description
Oscillator Output 2 is normally connected to a 32,768Hz crystal. Do not connect with external clock source.OSC25
Serial Clock Input. On SCLK’s rising edge, data is shifted into the internal shift register through DIN. On
SCLK’s falling edge, data is clocked out of DOUT.
SCLK4
Serial Data Out, D7 first bit out. Data is clocked out at the falling edge of SCLK. High impedance when CSis high.DOUT3
User-programmable output bit 1—programmed through the serial port.P18
User-programmable output bit 0—programmed through the serial port.P07
Oscillator Input 1 is normally connected to a 32,768Hz crystal, or may be connected to an external clock.OSC16
Serial Data In, D7 first bit in. Data is clocked into the register on the rising edge of SCLK.DIN2
PIN
CHIP SELECT Input has 3 functions: 1) When low, selects IC for communication; 2) on rising edge, loads
input shift register data into one of the command registers; 3) on falling edge, loads data from one of the
output registers into the output shift register. When CS is high, DOUT is high impedance.
CS1
FUNCTIONNAME